The Windows 8 release Preview has been released, so go out and get it, test it, and wax lyrically, or complain loudly. I'm installing it as we speak, so no word, thoughts, or impressions from me yet. Like it or hate it, at least have fun, folks.

That's what you "get" when you choose to use closed platform ... In a sense Windows 8 and iOS/OSX can help FLOSS word to spread out.
People may be so frustrated they would be more eager to try something else. However, it may just make them to install Windows XP/7 as well, so we'll see.

For me it's clear I will continue avoiding closed sourced, walled gardens for as long as I will be able to.